In LQT2 a sudden shot of adrenaline and increase in HR will cause the rise in
QTc, which is why alarm clocks
and such are the triggers for that one. LQT3 is the opposite way, as lower heart rates, and thus sleep are the triggers.
Here are a few other things to consider though: Long QT Type 1 predominately affects children, so if you are 27 and are still alive your phenotype would be extremely mild, likely never killing you, even if this is what you have.